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Not only need to know what do you use now.....but to help with replies....what is currently wrong with what you have (your view or what the shop is saying), what do you weigh, what kind of riding do you do, watts output, etc, etc. .....taking the question at face value I'd go out on a ledge and question if the shop was simply trying to sell you something for their benefit which in reality may not contribute anything toward you actually having a faster ride in the countryside?

Just try'n to help with added focus on current versus potential future.

LBS said stiffer. So anyone here has the experience? So is stiff helps me with climbing? I got nothing with the current crank just need to find out more from here rather than listening without asking opinion to those who has changed or did some similar research.

my weight is 58kg and i do mostly climbing. Thanks Tommasini.

tommasini wrote:Not only need to know what do you use now.....but to help with replies....what is currently wrong with what you have (your view or what the shop is saying), what do you weigh, what kind of riding do you do, watts output, etc, etc. .....taking the question at face value I'd go out on a ledge and question if the shop was simply trying to sell you something for their benefit which in reality may not contribute anything toward you actually having a faster ride in the countryside?

Just try'n to help with added focus on current versus potential future.

If you're paying with a big bag of coins, then buying new cranks will help with climbing in the overall weight saved. Besides that, no. Even if the rotor 3d crank was stiffer, which I would have to see test numbers to be convinced, it would make an immeasurably small difference, and even that is debatable. One thing that is not debatable is the shift quality between the two. Shimano wins out.

the 6700's are fine for stiffness. Not as light as a the rotors but down there you won't notice that you dropped a few grams except when you actually set the bike on a scale.

This Fairwheel test is not your 6700 crank but you can take some of the comments and results of that and compare to the rotor.....other than a few more grams that an Ultegra will carry over DuraAce, Shimano shares design features/methodology well amongst neighboring models and generations of equipment....meaning I'd suspect that the 6700 stiffness will be excellent and same rave over shifting with Shimano rings. http://fairwheelbikes.com/forum/viewtop ... 3e9#p99937

Unless you're now thinking of losing grams from the crank (original post was about getting a stiffer crank) I'd save the dough for something else that will provide a real benefit.....something such as (assuming you don't have one of such already) light and aero wheels, lower rolling resistant tires, heart rate monitor, power meter, etc

58kg - you don't need much stiffness anyways. I agree with all other posters, I wouldn't upgrade in search of increased stiffness. Rotor chainrings will however, look god awful with a shimano crank. If you are bothered by this then a rotor or even better, new sram crank, would be considered an upgrade, from an aesthetic point of view.